# (English) Securing Shiny with Google Auth

## Introduction

This vignette provides a step-by-step tutorial on how to secure a Shiny application using Google authentication through the tapLock R package. tapLock simplifies the integration of OpenID Connect and OAuth 2.0 into Shiny applications, ensuring robust security with minimal coding effort.

## Prerequisites

Before proceeding, ensure you have the following: - A basic understanding of R and Shiny. - A Shiny application ready for deployment. - Access to Google Developer Console for OAuth credentials. - (Optional) A server with HTTPS enabled.

## Step 1: Install tapLock

Install tapLock from GitHub using the `pak` package:

    install.packages("tapLock")

## Step 2: Create Google OAuth Credentials

1. Go to the Google Developer Console.
2. Create a new project or select an existing one.
3. Navigate to ‘Credentials’ and create ‘OAuth client ID’ credentials.
4. Set the `Authorized JavaScript origins` to your Shiny application URL.
5. Set the `Authorized redirect URIs` to your Shiny application URL with the suffix `/login`.
6. Note down the `client_id` and `client_secret`.

## Step 3: Configure Authentication in R

Load tapLock and set up the authentication configuration:

    library(taplock)

    auth_config <- new_openid_config(
      provider = "google",
      client_id = Sys.getenv("GOOGLE_CLIENT_ID"),
      client_secret = Sys.getenv("GOOGLE_CLIENT_SECRET"),
      app_url = Sys.getenv("SHINY_APP_URL")
    )

Replace `GOOGLE_CLIENT_ID`, `GOOGLE_CLIENT_SECRET`, and `SHINY_APP_URL` with your actual credentials and application URL in your environment variables.

## Step 4: Modify Shiny Application

Modify your Shiny app to use `sso_shiny_app`:

    library(shiny)
    library(tapLock)

    # Authentication configuration
    auth_config <- new_openid_config(
      provider = "google",
      client_id = Sys.getenv("GOOGLE_CLIENT_ID"),
      client_secret = Sys.getenv("GOOGLE_CLIENT_SECRET"),
      app_url = Sys.getenv("SHINY_APP_URL")
    )

    # UI
    ui <- fluidPage(
      tags$h1("Welcome to the Secure Shiny App"),
      textOutput("userInfo")
    )

    # Server
    server <- function(input, output, session) {
      output$userInfo <- renderText({
        user_email <- get_token_field(token(), "email")
        glue::glue("Logged in as: {user_email}")
      })
    }

    # Secure Shiny app with tapLock
    sso_shiny_app(auth_config, ui, server)

## Step 5: Deploy the Application

Deploy your Shiny application as you normally would. The tapLock package handles the authentication process. We recommend deploying your application with a solution like Shiny Server (Open Source or Pro) or with faucet. Solutions like Posit Connect already include authentication and do not require tapLock.

## Conclusion

By following these steps, you have successfully secured your Shiny application with Google authentication using tapLock. This ensures that only authenticated users can access your application, enhancing its security and privacy.